<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport"
          content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>朋友圈</title>

    <link rel="stylesheet" href="css/demo.css">
    <link rel="stylesheet" href="css/iconfont.css">
    <link rel="stylesheet prefetch" href="css/photoswipe.css">
    <link rel="stylesheet prefetch" href="css/default-skin/default-skin.css">
</head>

<body style="background-color: #fff;">
<div id="_contain">
    <div class="contain">
        <ul>
            <li>
                <div class="body">
                    <div class="text">
                        <div class="my-gallery" data-pswp-uid="2">
                            <figure>
                                <a href="img/s5.jpg" data-size="286x220"><img style="height:100%;" src="img/s5.jpg"></a>
                            </figure>
                            <figure>
                                <a href="img/sb1.jpg" data-size="640x426"><img style="height:100%;" src="img/sb1.jpg"></a>
                            </figure>
                            <figure>
                                <a href="img/sb3.jpg" data-size="768x1024"><img style="width:100%;" src="img/sb3.jpg"></a>
                            </figure>
                        </div>
                    </div>
                </div>
            </li>
        </ul>
    </div>
</div>

<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

    <div class="pswp__bg"></div>

    <div class="pswp__scroll-wrap">

        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>

        <div class="pswp__ui pswp__ui--hidden">

            <div class="pswp__top-bar">

                <div class="pswp__counter"></div>

                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                        <div class="pswp__preloader__cut">
                            <div class="pswp__preloader__donut"></div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div>
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>
</body>
<script src="js/jquery.min.js"></script>
<script src="js/photoswipe.js"></script>
<script src="js/photoswipe-ui-default.min.js"></script>
<script type="text/javascript">
    var initPhotoSwipeFromDOM = function(gallerySelector) {

        // 解析来自DOM元素幻灯片数据（URL，标题，大小...）
        // (children of gallerySelector)
        var parseThumbnailElements = function(el) {
            var thumbElements = el.childNodes,
                    numNodes = thumbElements.length,
                    items = [],
                    figureEl,
                    linkEl,
                    size,
                    item,
                    divEl;

            for(var i = 0; i < numNodes; i++) {

                figureEl = thumbElements[i]; // <figure> element
//                console.log(figureEl);

                // 仅包括元素节点
                if(figureEl.nodeType !== 1) {
                    continue;
                }
                divEl = figureEl.children[0];
//                linkEl = divEl.children[0]; // <a> element
                linkEl = divEl; // <a> element

                size = linkEl.getAttribute('data-size').split('x');

                // 创建幻灯片对象
                item = {
                    src: linkEl.getAttribute('href'),
                    w: parseInt(size[0], 10),
                    h: parseInt(size[1], 10)
                };



//                if(figureEl.children.length > 1) {
//                    // <figcaption> content
//                    item.title = figureEl.children[1].innerHTML;
//                }

                if(linkEl.children.length > 0) {
                    // <img> 缩略图节点, 检索缩略图网址
                    item.msrc = linkEl.children[0].getAttribute('src');
                }

                item.el = figureEl; // 保存链接元素 for getThumbBoundsFn
                items.push(item);
            }

            return items;
        };

        // 查找最近的父节点
        var closest = function closest(el, fn) {
            return el && ( fn(el) ? el : closest(el.parentNode, fn) );
        };

        // 当用户点击缩略图触发
        var onThumbnailsClick = function(e) {
            e = e || window.event;
            e.preventDefault ? e.preventDefault() : e.returnValue = false;

            var eTarget = e.target || e.srcElement;

            // find root element of slide
            var clickedListItem = closest(eTarget, function(el) {
                return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
            });

            if(!clickedListItem) {
                return;
            }

            // find index of clicked item by looping through all child nodes
            // alternatively, you may define index via data- attribute
            var clickedGallery = clickedListItem.parentNode,
                    childNodes = clickedListItem.parentNode.childNodes,
                    numChildNodes = childNodes.length,
                    nodeIndex = 0,
                    index;

            for (var i = 0; i < numChildNodes; i++) {
                if(childNodes[i].nodeType !== 1) {
                    continue;
                }

                if(childNodes[i] === clickedListItem) {
                    index = nodeIndex;
                    break;
                }
                nodeIndex++;
            }



            if(index >= 0) {
                // open PhotoSwipe if valid index found
                openPhotoSwipe( index, clickedGallery );
            }
            return false;
        };

        // parse picture index and gallery index from URL (#&pid=1&gid=2)
        var photoswipeParseHash = function() {
            var hash = window.location.hash.substring(1),
                    params = {};

            if(hash.length < 5) {
                return params;
            }

            var vars = hash.split('&');
            for (var i = 0; i < vars.length; i++) {
                if(!vars[i]) {
                    continue;
                }
                var pair = vars[i].split('=');
                if(pair.length < 2) {
                    continue;
                }
                params[pair[0]] = pair[1];
            }

            if(params.gid) {
                params.gid = parseInt(params.gid, 10);
            }

            return params;
        };

        var openPhotoSwipe = function(index, galleryElement, disableAnimation, fromURL) {
            var pswpElement = document.querySelectorAll('.pswp')[0],
                    gallery,
                    options,
                    items;

            items = parseThumbnailElements(galleryElement);

            // 这里可以定义参数
            options = {
                barsSize: {
                    top: 100,
                    bottom: 100
                },
                fullscreenEl : false,

                // define gallery index (for URL)
                galleryUID: galleryElement.getAttribute('data-pswp-uid'),

                getThumbBoundsFn: function(index) {
                    // See Options -> getThumbBoundsFn section of documentation for more info
                    var thumbnail = items[index].el.getElementsByTagName('img')[0], // find thumbnail
                            pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
                            rect = thumbnail.getBoundingClientRect();

                    return {x:rect.left, y:rect.top + pageYScroll, w:rect.width};
                }

            };

            // PhotoSwipe opened from URL
            if(fromURL) {
                if(options.galleryPIDs) {
                    // parse real index when custom PIDs are used
                    for(var j = 0; j < items.length; j++) {
                        if(items[j].pid == index) {
                            options.index = j;
                            break;
                        }
                    }
                } else {
                    // in URL indexes start from 1
                    options.index = parseInt(index, 10) - 1;
                }
            } else {
                options.index = parseInt(index, 10);
            }

            // exit if index not found
            if( isNaN(options.index) ) {
                return;
            }

            if(disableAnimation) {
                options.showAnimationDuration = 0;
            }

            // Pass data to PhotoSwipe and initialize it
            gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
            gallery.init();
        };

        // loop through all gallery elements and bind events
        var galleryElements = document.querySelectorAll( gallerySelector );

        for(var i = 0, l = galleryElements.length; i < l; i++) {
            galleryElements[i].setAttribute('data-pswp-uid', i+1);
            galleryElements[i].onclick = onThumbnailsClick;
        }

        // Parse URL and open gallery if it contains #&pid=3&gid=1
        var hashData = photoswipeParseHash();
        if(hashData.pid && hashData.gid) {
            openPhotoSwipe( hashData.pid ,  galleryElements[ hashData.gid - 1 ], true, true );
        }
    };

    // execute above function
    initPhotoSwipeFromDOM('.my-gallery');


    $(".my-gallery>figure").each(function(){
        $(this).height($(this).width());
    });
</script>
</html>
